68388904357 has 2 divisors, whose sum is σ = 68388904358. Its totient is φ = 68388904356.

The previous prime is 68388904343. The next prime is 68388904417. The reversal of 68388904357 is 75340988386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62956329921 + 5432574436 = 250911^2 + 73706^2 .

It is a cyclic number.

It is not a de Polignac number, because 68388904357 - 2¹⁹ = 68388380069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68388904295 and 68388904304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68388904327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34194452178 + 34194452179.

It is an arithmetic number, because the mean of its divisors is an integer number (34194452179).

Almost surely, 2^68388904357 is an apocalyptic number.

It is an amenable number.

68388904357 is a deficient number, since it is larger than the sum of its proper divisors (1).

68388904357 is an equidigital number, since it uses as much as digits as its factorization.

68388904357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 68388904357 in words is "sixty-eight billion, three hundred eighty-eight million, nine hundred four thousand, three hundred fifty-seven".